package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetMealMapper setMealMapper;

    @Override
    @Transactional
    public void add(ShoppingCartDTO shoppingCartDTO) {
        //判断商品是否存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //如果存在，数量加1
        if (list != null && list.size() > 0) {
            ShoppingCart cartService = list.get(0);
            cartService.setNumber(cartService.getNumber() + 1);
            shoppingCartMapper.update(cartService);
        }else{
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setMealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }
        }

    @Override
    public List<ShoppingCart> list() {
        Long currentId = BaseContext.getCurrentId();
        ShoppingCart build = ShoppingCart.builder().userId(currentId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(build);
        return list;
    }

    @Override
    public void clean() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    @Override
    @Transactional
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        ShoppingCart cartService = list.get(0);
        if(cartService.getDishId() != null){
            if (cartService.getNumber()==1){
                shoppingCartMapper.deleteById(cartService);
            }
            cartService.setNumber(cartService.getNumber()-1);
            shoppingCartMapper.update(cartService);
        }else{
            if (cartService.getNumber()==1){
                shoppingCartMapper.deleteById(cartService);
            }
            cartService.setNumber(cartService.getNumber()-1);
            shoppingCartMapper.update(cartService);
        }

    }
}
